Amazon opens huge distribution warehouse in south-west Sydney

Global online shopping giant Amazon has opened a distribution warehouse in Sydney's south-west, doubling down on its push into the Australian market.

The 43,000 square metre facility in Moorebank is double the size of Amazon's only other distribution centre in Melbourne.

The warehouse will enable Amazon to ramp up its delivery service across the country and provide a big boost to local jobs.

The warehouse will enable Amazon to ramp up its delivery service across the country. (Nine)The 43,000 square metre facility in Moorebank, is double the size of Amazon's only other distribution centre in Melbourne. (Nine)

"We expect there will be hundreds of new roles at the Moorebank centre over the long term," a spokesperson for Amazon said.

The company has received a lukewarm reception from Australians since it's launch, leaving experts questioning the online behemoth's long term viability here.

Unions NSW has raised its eyebrows on Amazon's overseas management of staff and conditions. Most of the new jobs will be through labour hire company Adecco, which means workers cannot collectively bargain with Amazon because they are not technically their employer.

"The CEO makes in eight seconds what the average workers make in a whole year," Unions NSW Secretary Mark Morey said.

"This is an organisation based on exploitation and we are going to keep a very close eye on it."